Solve Problem 9 using the critical region method of testing. Since the sampling distribution of is the normal distribution, you can use critical values from the standard normal distribution as shown in Figure 9-8 or part (c) of Table 3 of the Appendix. Compare your conclusions with the conclusions obtained by using the P-value method. Are they the same?
Table 3

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(c) Hypothesis Testing, Critical Values o Level of Significance Critical value zo for a left-tailed test Critical value zo for a right-tailed test Critical values ±zo for a two-tailed test α=0.05 -1.645 1.645 1.96 α=0.01 -2.33 2.33 £2.58